<?php 
// load the error handling module 
require_once('error_handler.php'); 
// specify that we're outputting an XML document 
header('Content-Type: text/xml'); 
// calculate the result 
$firstNumber = $_GET['firstNumber']; 
$secondNumber = $_GET['secondNumber']; 
$result = $firstNumber / $secondNumber; 
// create a new XML document 
$dom = new DOMDocument(); 
// create the root <response> element and add it to the document 
$response = $dom->createElement('response'); 
$dom->appendChild($response); 
// add the calculated sqrt value as a text node child of <response> 
$responseText = $dom->createTextNode($result); 
$response->appendChild($responseText); 
// build the XML structure in a string variable 
$xmlString = $dom->saveXML(); 
// output the XML string 
echo $xmlString; 
?> 